Strut-and-Tie Method as a Basis for Optimization of Hoop Prestressed Tendons in Abnormally Shaped Anchorage Zone of Cable-Stayed Bridge Pylon

Based on full-scale segment model tests of the abnormally shaped anchorage zone of the Maling River cable-stayed bridge pylon and FEM analysis, its mechanical and deformation properties were obtained, and the validity of FEM analysis was verified.An optimal layout of prestressed tendons in the anchorage zone was obtained by using the strut-and-tie method (STM).The comparison FEM analysis between the full-scale segment model and the optimal prestressed tendons model show that:the optimal model not only saves prestressed tendons, but also achieves the same cracking resistance; STM method is reliable and accurate in the analysis of the abnormally shaped anchorage zone of cable-stayed bridge pylon.     

宁江松花江特大桥主桥方案设计及对比研究

宁江松花江特大桥是跨越松花江的一座特大桥,选定合理的桥梁结构至关重要。简要介绍了初步设计对主桥桥型方案的比选情况和设计思路,共5种桥型方案,分别为连续箱梁、双塔斜拉、矮塔斜拉、连续梁、中承式钢管混凝土拱桥,经过比较选择,确定采用跨径为(95+3×150+95)m的矮塔斜拉桥方案。     

荆岳长江公路大桥主塔下横梁施工技术

结合荆岳长江公路大桥主塔下横梁的工程实践,着重介绍了大跨径斜拉桥下横梁的施工难点和采取的技术措施,并对下横梁进行了计算分析,计算结果满足要求。     

提高斜拉桥主塔混凝土耐久性的对策

以湖北鄂东长江公路大桥主塔施工为背景,对提高混凝土耐久性的对策进行了探讨和研究。实践证明:通过精选原材料、优化混凝土配合比设计以及规范施工工艺等手段,能够有效保证斜拉桥高塔混凝土高工作性、抗碱集料反应、抗裂性、抗有害离子渗透等性能。     

斜拉桥塔梁同步施工可行性研究与施工控制

马岭河特大桥8号墩采用塔梁同步施工,9号墩采用先主塔后主梁的非塔梁同步施工。该文分别建立了这两种施工方法的模拟计算模型,通过对这两种模型的计算结果进行对比分析,从主梁和主塔两个方面论证了塔梁同步施工的可行性;结合该桥的工程实例,分别阐述了在塔梁同步施工情况下主梁和主塔施工措施和控制技术。     

马鞍山长江公路大桥主桥钢护筒沉放技术研究

介绍马鞍山长江公路大桥北边塔钢护筒施振：振动锤的选择,钢护筒施振情况介绍,钢护筒构造的优化     

砼斜拉桥施工技术小结

介绍常州京杭运河改造工程钟楼大桥砼斜拉桥的施工工艺     

特异变截面倾斜钢索塔节段制造与安装技术

结合青林湾大桥钢索塔的施工,介绍变截面钢索塔的设计特点,详细论述钢索塔的制造工艺和安装方法.重点对钢索塔制造和安装施工过程中节段的制造、节段的吊装工艺等主要技术进行了总结,对同类钢索塔制造和施工有一定的参考价值.     

矮塔斜拉桥索梁活载比的特性研究

索梁活载比是针对新桥型——矮塔斜拉桥提出的一个概念。为了进一步明确其力学特征,研究了索梁活载比与支承条件、主梁惯距、拉索倾角和面积等设计参数的关系,并详细讨论了活载比对矮塔斜拉桥的静力特性影响,即索梁活载比与挠度、弯矩、应力变幅的关系。研究表明,索梁活载比包含了矮塔斜拉桥的塔、梁、索以及支承条件等的主要结构特征,能反映结构特性,可以将其看作矮塔斜拉桥的结构特征参数,有助于认识斜拉体系桥的力学行为,同时有助于概念设计阶段的设计。     

Internal Force Distribution in Steel-Concrete Composite Structure for Pylon of Cable-Stayed Bridge

Adopting a steel-anchor beam and steel corbel composite structure in the anchor zone on pylon is one of the key techniques for the design of Jintang bridge, a cable-stayed bridge in Zhoushan, China. In order to ensure the safety of the steel-concrete composite structure, a stud connector model for the joint section was put forward. Experiments were conducted to obtain the relation between load and slip of specimen, the failure pattern of stud connector, the yield bearing capacity and ultimate bearing capacity of a single stud, etc. The whole process of the structural behavior of the specimen was comprehensively analyzed. The features of the internal force distribution in the steel-concrete composite structure and the strain distribution of stud connector under different loads were emphatically studied. The test results show that the stud connector is applicable for the steel-concrete composite structure for pylon of Jintang bridge. The stud has a good ductility performance and a obvious yield process before its destruction. The stud connector basically works in a state of elasticity under a load less than the yield load.